Air treatment unit or similar article



FIG. 1 is a front and top perspective view of an air treatment unit or similar article showing my new design;

FIG. 2 is a rear, bottom perspective view thereof;

FIG. 3 is a front and top perspective view of an air treatment unit or similar article showing a second embodiment of my new design;

FIG. 4 is a front and top perspective view of an air treatment unit or similar article showing a third embodiment of my new design;

FIG. 5 is a rear and bottom perspective view of FIG. 3; and

FIG. 6 is a rear and bottom perspective view of FIG. 4. 

The ornamental design for an air treatment unit or similar article, as shown and described. 